白骨壤模拟湿地系统中Pb的分布、迁移及其净化效应  

Lead cycling in a simulated wastewater-affected mangrove( Avicennia marina ) wetland system

作　　者：陈桂葵[1] 陈桂珠[2] 

机构地区：[1]华南农业大学农学院,广州510642 [2]中山大学环境科学研究所,广州510275

出　　处：《生态科学》2005年第1期28-30,34,共4页Ecological Science

基　　金：国家自然科学基金资助项目(39470151)

摘　　要：在温室中建立红树林植物白骨壤模拟湿地系统,分别用正常(NW)、5倍(FW)和10倍(TW)浓度人工配置的城市污水每周定时定量对模拟系统污灌2次,用海水作对照(CL),持续1年。研究重金属Pb在湿地系统中的分布、迁移及其被净化的效果。结果表明:加入系统中的Pb主要存留于土壤子系统中,很少迁移到植物体和凋落物中;植物各器官中的Pb含量在根中最高;模拟系统对重金属Pb的净化效果显著,各污水处理组分别为:NW组97.97%、FW组97.86%、TW组98.06%。根据物质平衡模型计算得土壤子系统Pb的环境容量较大,因此整个模拟系统对Pb污染的承受力较大。A greenhouse experiment was conducted to investigate the cycling of lead in an artificial mangrove wetland system receiving Pb-containing “wastewater”. Avicennia marina was selected as the only tested mangrove plant species, which grew in tanks containing soils collected from a mangrove tidal wetland in Shenzhen, South China. Artificial seawater with salinity of 15 ‰ was pumped into and out of the tanks at regular intervals to simulated semi-diurnal tidal conditions. Synthetic wastewater containing various levels of lead (control, NW, FW and TW ) was discharged into the artificial wetland twice a week for a year. The results show that large amounts of lead in the “wastewater” were removed by the soil after entering the artificial wetland system and the amount of soil-retained lead increased with increasing content of lead in the importing wastewater although the amount of lead remained in the artificial tidal water also increased with increasing content of lead in the importing wastewater. In general, the concentration of lead in roots is higher than it in stems and leaves. The study demonstrated that artificial wetland system had high efficiency to remove lead from the synthetic wastewater. The removal rates were 97.97%,97.86% and 98.06% for treatments NW, FW and TW, respectively. As the environmental capacity of lead in soil subsystem is calculated according to the model of matter balance, the simulated wetland has a high capacity for bearing the heavy metal pollution of lead, which has implications for the management of wastewater using mangrove wetlands.

关 键 词：白骨壤 模拟湿地系统 PB 分布 迁移 净化效应 

分 类 号：X131[环境科学与工程—环境科学]